JP2619620B2 - Lock mechanism for container lifting platform - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lock mechanism which is fitted to a lifting fork of a forklift to prevent a lifting stand for carrying and lifting a container from falling off the lifting fork.

[0002]

2. Description of the Related Art Conventionally, for example, a cylindrical container (7) having a ridge (71) having a rounded upper edge, such as a drum can, is lifted and lowered by a forklift via a lifting stand (1) and transported. Have been. This type of lifting stand (1) is, as shown in FIG.
It is used by being fitted to an elevating fork (6) provided in a traveling direction of a forklift (not shown) (hereinafter referred to as "forward"). The lifting stand (1) includes a frame (11) provided with a sheath (2) provided in accordance with the number of lifting and lowering forks (6) and two connecting rods (12) before and after connecting the sheath (2). ) And the front connecting rod (1
A clamp comprising a support column (13) protruding from 2) and a pair of claws (51) (52) provided on the support column (13) and urged in the opening direction by a spring (57). It comprises a mechanism (5).

[0003] The container (7) is gripped by the lifting stand (1) as shown below. First, the lifting fork (6) is inserted into the sheath (2) of the lifting platform (1), and the upper claws (5) of the lifting platform (1) are inserted.
The height position between the lower claws (1) and the lower claws (52) is
Adjust the height of the lifting fork (6) to correspond to (1). While maintaining this height, the forklift is moved forward, and the lower pawl (52) is brought into contact with the body of the container (7), and then the lifting / lowering fork (6) is raised. When the lower claw (52) hits the upper edge ridge (71), the upper claw (51) linked to the lower claw (52) relatively lowers against the spring (57), and the lower claw (52) Ridges (7
When the user lifts the lifting fork (6) by grasping one point of (1), the container (7) is lifted. When the container (7) is lifted, the body of the container (7) comes into contact with the arc-shaped recess formed substantially at the center of the support column (13), and the container (7) is slightly inclined and the lifting table (1) is inclined. ).

[0004]

The sheath (2) is formed with a margin in the height direction so that the lifting fork (6) can be easily inserted into the lifting stand (1). Since the supporting portion of the container (7) is in front of the lifting platform (1), the center of gravity of the lifting platform (1) when gripping the container (7) is in front of the lifting platform (1). . The lifting platform (1) holding the container (7) is shown in FIG.
As shown in FIG. Therefore, when the heavy container (7) is carried by the lifting platform (1), the lifting platform (1) may fall off when the forklift is stopped. Even if the lifting platform (1) supporting the container (7) is mounted on the lifting fork (6) so that the entire lifting platform (1) is in a straight posture, when the forklift is suddenly stopped, the lifting platform (1) is also moved from the lifting fork (6). The problem of sliding down occurs. Lifting platform
In order to prevent (1) from falling off, the lifting platform (1) can be fixed to the lifting fork (6) with bolts, etc., but it takes much time and the transportation platform other than the lifting platform (1) is connected to the forklift. When installing, it is necessary to remove the bolt, which is inconvenient.

Therefore, the inventor of the present invention has proposed that the lifting platform (1) is not always fixed to the lifting and lowering fork (6), but the lifting platform (1).
When the lifting fork (6) is placed on the floor, the lifting fork (6) can be freely attached and detached without being locked, and when the lifting fork (6) is lifted off the floor, the lifting mechanism (1) does not fall off the lifting fork (6). Through trial and error, the present invention has been achieved.

An object of the present invention is to prevent the lifting table from falling off the lifting fork by operating the lock mechanism only when the lifting table is lifted by the lifting fork. It is an object of the present invention to provide a lifting stand in which a lock mechanism is released and a lifting fork can be freely taken in and out.

[0007]

Means for Solving the Problems In order to solve the above-mentioned problems, a lock mechanism of a container lifting stand according to the present invention comprises:
A fork holder (31) is provided inside the sheath part (2) so as to be able to move up and down, and a part of the fork holder (31) comes out of the sheath part (2),
The protruding part does not operate when the lifting platform (1) is supported by the floor, but is connected to a link mechanism (3) having downward biasing means that operates when the lifting platform (1) is lifted from the floor. , Fork restraint by downward biasing of biasing means (31)
Moves upward to abut and fix the lifting fork (6).
Further, the link mechanism (3) includes first, second and third link pieces (3
3), (34) and (35), the upper part of the first link piece (33) is pivotally supported on the sheath part (2) in a vertical plane so as to be swingable. ) At the lower free end, the lower surface opening of the sheath (2)
The third link piece (35) is pivotally connected to a fork holder (31) arranged vertically movably from (21) so that the third link piece (35) can swing in the vertical direction toward the other end of the sheath (2). The second movable shaft (39) is pivotally connected to the second movable shaft (39) above the pivot portion,
The link piece (34) includes the first link piece (33) and the second movable shaft (39).
And the urging means is provided with a third link piece (3) separated from a plane including the second localization axis (37) and the second movable axis (39).
It is connected to 5). Further, a weight (32) is used as the urging means.

[0008]

The lock mechanism utilizes a link mechanism (3) centered on a first localization axis (36) and a second localization axis (37).
When the lifting platform (1) is placed on the floor (8), the weight (32)
Are waiting in a state approaching the lifting platform (1). When the lifting fork (6) is inserted into the sheath (2) of the lifting platform (1), and the lifting fork (6) is raised, the lifting platform (1) is lifted. 2 The lower part moves around the localization axis (37), and the third link piece (35) moves to the second localization axis (37).
Rotate around. When the third link piece (35) rotates, the first movable shaft (38) and the first link piece (33), which are connected to the second movable shaft (39) via the second link piece (34), become the first link piece (33). The fork holder (31) provided on the first movable shaft (38) moves upward about the stereotactic shaft (36), which is opposite to the rotation direction of the weight body (32). The upper surface of the fork holder (31) contacts the lower surface of the lifting fork (6),
(6) and the lifting stand (1) can be fixed. After the lifting platform (1) is locked to the lifting fork (6) by the lock mechanism, the cylindrical container (7) is gripped by the clamp mechanism (5) and transported to a desired position as in the related art. The gripping of the cylindrical container (7) by the clamp mechanism (5) is released.

In order to extract the lifting platform (1) from the lifting fork (6), the lifting platform (6) is lowered and the lifting platform (1) is lowered.
Place (1) on floor (8). When the lifting platform (1) is placed on the floor (8),
The weight (32) that has moved downward moves in a direction approaching the lifting platform (1). With the movement of the weight (32), the third link piece (35) rotates about the second localization axis (37), and the second link piece (34) is pulled, thereby causing the first movable axis (38) to move. ) And the first link piece (33) move downward around the first localization axis (36), the fork holder (31) also moves downward, and the upper surface of the fork holder (31) 6) Apart from the lower surface,
The lock is released. Thereafter, the forklift can be moved backward to remove the lifting fork (6) from the lifting stand (1).

[0010]

According to the lock mechanism for the lifting platform (1) of the container (7) having the above-mentioned structure, the lifting mechanism is locked by inserting the lifting fork (6) into the lifting platform (1) and lifting it. When (1) is placed on the floor (8), the lock is released.
In addition, the user can automatically lock and unlock the lifting stand (1) and the lifting fork (6) simply by performing a normal transport operation, so that the trouble of locking can be saved and the lock can be locked. I will never forget. Therefore, the lock can be securely performed at the time of use, and the lifting fork of the lifting platform (1) can be used.
(6) Dropping is prevented.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. In this embodiment, a lifting platform (1) having one clamp mechanism (5) for gripping a cylindrical cylindrical container (7) will be described. The structure, the gripping method, and the radix of the clamp mechanism (5) are described. Is not limited to this. FIG. 1 shows a state in which an elevating fork (6) of a forklift (not shown) is fitted and the lifting stand (1) is lifted and locked, and FIG. 2 is a state in which the elevating fork (6) is fitted. The lifting platform (1) without the device is shown. In the following description, the front is the forward side of the forklift, and the rear is the reverse side.

First, the configuration of the lifting platform (1) will be described, and then the lock mechanism of the present invention will be described in detail. The lifting platform (1) has two parallel sheaths into which the lifting forks (6) fit.
(2) a frame (11) connected by two connecting rods (12),
And a support column (13) protruding from the frame (11) and having a clamp mechanism (5). As shown in FIGS. 2 and 3, the sheath (2) is a cylindrical body having a substantially rectangular cross section with one end opened, and is arranged side by side with the openings aligned. The supporting rods (22) are connected to each other by connecting rods (12), and support bases (22) are protrudingly provided on the open side and the closed side of each of the sheaths (2).
1) is formed. The lifting fork (6) is inserted from the rear side of the sheath (2). A support column (13) is protruded substantially in the middle of the front connection rod (12), and the rear connection rod (12) and the upper end of the support column (13) are connected by a support rod (14), Support column (13) is reinforced.

The front end of the sheath (2) is connected by a connecting rod (17), and a central portion of the connecting rod (17) forms an arc-shaped recess recessed between the sheaths (2). I have. Bases (15) at both ends of the arc-shaped concave portion
And a rubber belt (16) is stretched between the pedestals (15). At the upper end of the support column (13), a clamp table (53) having a clamp mechanism (5) is provided so as to project forward. The clamp base (53) is formed in an inverted L-shaped hollow housing whose upper part protrudes forward, and has a lower claw (52) and an upper claw (51) provided therein. The upper claw (51) is connected to a pin (5) provided above the clamp base (53).
According to 4), the lever (55) whose base end is rotatably supported has a claw (56) at the distal end, and is urged upward by a spring (57). Lower claw (52) is a vertically movable round shaft (58)
The upper part of the round shaft (58) is pivotally connected to a substantially central portion of the lever (55) of the upper claw (51). . The round shaft (58) is provided slidably up and down in a cylindrical body formed below the clamp table (53).

Next, the lock mechanism of the present invention will be described. The locking mechanism includes a sheath (2) as shown in FIGS.
And a link piece (35) provided at one end with a link piece (33) (34) provided on the outer surface of the sheath (2) and a weight (32) at one end. Be composed. Since the lock mechanism is provided symmetrically at the left and right sheaths (2), the lock mechanism provided at the right sheath (2) will be described below.

A bearing (23) provided on the upper surface of the rear side of the sheath (2) (the side where the lifting fork (6) is inserted) is provided with a connecting rod (12) of the frame (11) so as to be parallel and rotatable. A first localization axis (36) is provided, and a first link piece is provided at each end of the first localization axis (36).
(33) is pivotally supported. A first movable shaft (38) is pivotally supported between the free ends of the first link pieces (33).
At the center of 8), a fork holder (31) is pivotally supported. The fork holder (31) has a holding surface (31a) at the upper end capable of abutting the lifting fork (6), a plate piece protruding downward from the holding surface (31a), and a shaft hole is formed in the plate piece. Opened and formed. In the center of the rear bottom surface of the sheath (2), an opening (21) long in the front-rear direction is formed. The fork holder (31) has a holding surface (31a) with a sheath (2).
Into the inside of the plate, the opening portion of the plate hole of the plate piece, the opening (21)
The first movable shaft (38)
Pivoted on.

A bearing (24) is provided on the front lower surface of the sheath (2).
Is disposed, and a second localization axis (37) is pivotally supported on the bearing (24) in a plane perpendicular to the front-rear direction, and the second localization axis is
A third link piece (35) is pivotally supported at the inner end of (37). Third
As shown in FIGS. 5 and 6, the link piece (35) has a substantially inverted L-shape, and the connecting portion between the vertically short portion (35b) and the horizontally long portion (35a) is connected to the second localization axis (37). Be pivoted. A substantially cylindrical weight (32) made of lead, brass or the like is provided between the free ends of the horizontally long portions (35a) of the third link pieces (35) provided on the right and left sheaths (2), respectively. It is connected by. The free end of the short vertical portion (35b) of the third link piece (35) is pivotally supported by the second movable shaft (39) on the upper surface on the front side of the sheath (2). A second link piece (34) is pivotally connected between the second movable shaft (39) and the first movable shaft (38). Sheath part (2)
A roller shaft (41) that rotatably supports the roller (4) is provided below the side surface near the opening at the rear of the roller. The roller
The highest part of (4) is the fork restraint (3)
It is arranged to be higher than the holding surface (31a) of 1).
As a result, the lifting fork (6) is guided by the roller (4) and is accommodated in the sheath (2), and the tip of the lifting fork (6) hits the fork holder (31), thereby damaging the fork holder (31). , And does not hinder the entry of the lifting fork (6).

The state where the lifting stand (1) is grounded (FIG. 2)
In FIG. 5), the fork holder (31) is waiting at the lower part in the sheath (2). When the lifting fork (6) of the forklift is inserted into the sheath (2), the lower surface of the lifting fork (6) is guided by the rollers (4) and is accommodated in the sheath (2). afterwards,
When the lifting fork (6) is moved upward (Fig. 6), the lifting platform
(1) is lifted upward. At this time, the weight (32) moves downward by its own weight and moves away from the sheath (2). When the weight body (32) moves downward, the third link piece (35) rotates about the second localization axis (37). By this rotation, the second movable shaft (39) pivotally supported by the third link piece (35) moves in the direction of pressing the second link piece (34), and the second link piece (34) moves rearward. I do. The movement of the second link piece (34) causes the first link piece (33) to swing backward. By this swing,
The fork holder (31) moves upward in the diagonally rearward direction and comes into contact with the lower surface of the lifting / lowering fork (6). At this time, the lifting fork
(6) The lower surface is in contact with the fork holder (31) and the roller (4), the front end of the upper surface is fixed in contact with the inner surface of the sheath (2), and the lifting fork of the lifting platform (1) is (6) Dropping is prevented. In the present invention, the lifting fork (6) is fixed by the vertical movement of the fork holder (31). Therefore, for example, when the lifting fork (6) is thin,
When the upward movement of (1) is large and the thickness is large, the upward movement of the fork holder (31) is small, and the fork holder (31) comes into contact with the lifting fork (6) and is fixed. )
There is no need to adjust the thickness.

After fixing the lifting platform (1) to the lifting fork (6), the forklift is moved forward to bring the lifting platform (1) close to the container (7) placed upright on the floor (8), The upper nail (51) and the lower nail (5) of the clamp mechanism (5) are attached to the ridge (71) on the upper edge of the container (7).
Position the lifting platform (1) so that the gap in (2) corresponds. Next, the forklift is advanced so that the clamp mechanism (5) faces the axis of the container (7), and the lower pawl (52) is removed from the container (7).
To the torso. When the forklift (6) is raised while the forklift is moving forward at a low speed in this state, the lower claws (52)
Strikes the lower surface of the ridge (71), and the lower claw (52) descends. The upper claw (51) rotates downward in conjunction with the lowering of the lower claw (52), and the upper edge of the container (7) is gripped by the upper claw (51) and the lower claw (52), and the container ( 7) is lifted. Lifted container
(7) is supported by a rubber belt stretched at the front end of the frame (11) (FIG. 6).

After grasping the container (7), the forklift is moved to a desired position, and the lifting fork (6) is lowered while moving backward at a low speed. Nails (5
1) is pushed up, a gap is created between the upper nail (51) and the lower nail (52),
The ridge (71) of the container (7) is released from the clamp mechanism (5), and the container (7) can be placed at a desired position.

When the lifting platform (1) is removed from the lifting fork (6), the lifting body (32) is first lowered and the weight body (32) is grounded. When the lifting fork (6) is further lowered, the distance between the sheath (2) and the weight (32) is reduced, and the third link piece (35) is fixed around the second stereotactic axis (37). Rotates in the opposite direction. By this rotation, the third link piece (35)
The second movable shaft (39) pivotally moved in the direction moves in the direction of pulling the second link piece (34), and the second link piece (34) moves forward. The movement of the second link piece (34) causes the first link piece (3
3) swings forward. By this swing, fork holding
(31) moves downward, separates from the lower surface of the lifting fork (6), and releases the fixing of the lifting fork (6). Thereafter, the forklift is retracted, and the lifting fork (6) is extracted from the lifting platform (1).

In the above embodiment, the fork holder (31) is provided behind the sheath (2), and the fork holder (31) moves upward in the obliquely rearward direction when locked. When the lifting platform (1) is locked and the lifting platform (1) receives a force in the dropping direction that is greater than the locking force from the lifting fork (6), the lifting fork (6) and the fork holder are held down.
(31) move rearward, and the fork holder (31) does not separate from the lifting fork (6).
1) is slightly rotated in the direction of arrow A in FIG. 6, and as shown in FIG. 7, the lower surface of the lifting fork (6) is brought into contact with the holding surface (31a) and the sheath.
This is because the structure is more firmly fixed between the inner surfaces of (2).

When the forklift is suddenly stopped,
Since the weight body (32) moves in the direction of arrow B in FIG. 6 due to the inertial force, as shown in FIG. 7, the fork holder (31) is further pressed toward the lower surface of the lifting and lowering fork (6), and the lifting stand ( Prevent dropping of 1).

Instead of disposing the weight body (32) as a biasing means, as shown in FIG. 8, the support rod (18) is passed between the sheaths (2) to pass through the horizontally long part (35a) of the third link piece (35). ) Free end and support rod
(18), a spring (32a) for pressing the free end downward.
The same effect can be obtained by deploying.

The description of the above embodiments is for the purpose of illustrating the present invention and should not be construed as limiting the invention described in the appended claims or reducing the scope thereof. Further, the configuration of each part of the present invention is not limited to the above-described embodiment, and it is needless to say that various modifications can be made within the technical scope described in the claims.

An object of the present invention is to lift the lifting fork (6) after inserting the lifting fork (6) into the lifting platform (1), and the lifting platform (1) is locked by the lifting fork (6). When the fork (6) is lowered and the lifting stand (1) is grounded, the lock is released and a lock mechanism capable of removing the lifting fork (6) is provided. For example, a link mechanism (3) is provided. It is apparent that the configuration of ()) is not limited to the above-described embodiment, and other configurations can be easily adopted.

[Brief description of the drawings]

FIG. 1 is a side view of a lifting stand according to the present invention when a container is gripped.

FIG. 2 is a side view showing a state where the lifting stand of the present invention is placed on the floor.

FIG. 3 is a sectional view taken along line XX of FIG. 3;

FIG. 4 is an exploded view of the lock mechanism.

FIG. 5 is an enlarged sectional view of a sheath.

FIG. 6 is an enlarged cross-sectional view when the sheath is locked.

FIG. 7 is an enlarged sectional view when the sheath is locked.

FIG. 8 is an enlarged sectional view of a lock mechanism using a spring.

FIG. 9 is a side view of a conventional lifting platform.

[Explanation of symbols]

 (1) Lifting stand (2) Sheath (3) Link mechanism (31) Fork holder (32) Weight (6) Lifting fork

Claims (5)

(57) [Claims] A clamping mechanism (5) for supporting a container (7) is provided on a sheath (2) into which a lifting fork (6) of a forklift fits or a frame (11) having a sheath (2), A lock mechanism for automatically locking the lifting table (1) for lifting the container (7) by lifting the lifting fork (6) to prevent the lifting table (1) from coming off the lifting fork (6). Is equipped with a fork holder (31) that can be moved up and down, and a part of the fork holder (31) is made to come out of the sheath (2), and the lifting part (1) is supported by the floor surface. It is not operated in the state of being pushed, but is linked to a link mechanism (3) having downward biasing means operating in a state of being lifted from the floor, and fork holding (3) is performed by downward biasing of the biasing means.
(1) A lifting mechanism for a container, wherein the lifting fork (6) is moved upward to abut and fix the lifting fork (6). The link mechanism (3) includes first, second and third links.
The upper part of the first link piece (33) is pivotally supported on the sheath (2) in a vertical plane so as to be swingable in the vertical plane. The lower free end of the piece (33) is pivotally connected to a fork holder (31) arranged to be vertically movable from the lower opening (21) of the sheath (2), and the third link piece (35) is The other end of the sheath (2) pivotally supported on the second stereoscopic shaft (37) in a vertical plane in a vertical plane, and is pivotally connected to the second movable shaft (39) above the pivoted portion; The second link piece (34) includes the first link piece (33) and the second movable shaft.
(39), and the biasing means is connected to a third link piece (35) separated from a plane including the second localization axis (37) and the second movable axis (39). The sheath (2) is fitted to the lifting fork (6), and the lifting fork (6)
Is raised, the second link piece (34) linked to the third link piece (35) presses the first link piece (33) due to the downward biasing of the biasing means, and the first link piece ( 3. A container hoist according to claim 1, wherein the fork holder (31) is swung upwardly to move upward and abut against the lower surface of the lifting fork (6) to fix the lifting fork (6). Table lock mechanism. 3. The lock mechanism according to claim 1, wherein the urging means is a weight (32). 4. The urging means comprises a frame (11) and a link mechanism.
3. The lock mechanism for a lifting stand of a container according to claim 1, wherein the lock mechanism is a spring disposed between the lock mechanism and the container. 5. A guide mechanism comprising a roller (4) and a roller shaft (41) is provided at an opening of the sheath (2) in the direction of insertion of the lifting / lowering fork (6). , Lifting stand (1)
The lock mechanism for a container lifting stand according to claim 1 or 2, wherein the lock mechanism is located above an upper surface of the fork holder (31) when the fork holder (31) is placed on the floor (8).